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The '''Justice League OverPower''' expansion debuted in February 1997 with 197 cards ''(20 [[Character Cards]], 134 [[Special Cards]], 7 [[Mission Cards]], 1 [[Power Cards|Power card]], 6 [[Event Cards]], 15 [[Universe: Ally|Ally Cards]], 14 [[Tactic: Doubleshot|Doubleshot Cards]])''.==Distribution==Cards were distributed in:* Booster packs of 15 cards* Booster boxes of thirty-six 15 card booster packs==New Special Card codes==With the '''Justice League OverPower''' release, the following Special Card codes were introduced: [[JA]] [[JB]] [[JC]] [[JD]] [[JE]] [[JF]] [[JG]] [[JH]] [[JI]] [[JJ]] [[JK]] [[JL]] [[JM]] [[JN]]==New card types==[[Tactic: Doubleshot|Doubleshot Cards]] were introduced.